Slice the beef into thin pieces, across the grain. Marinate the beef with the Marinade, for about 20 minutes.

Mix all the ingredients in the Teriyaki Sauce. Heat up a small sauce pan and prepare the sauce. As soon as the sauce starts to bubble, remove it from the heat.

Add some oil to your skillet and pan-fry the beef, until slightly charred. Transfer the beef to a serving dish, and add the Teriyaki Sauce on top. Garnish with white sesame seeds and chopped scallions, if used. Serve the beef teriyaki immediately with steamed white rice.